About the default value of dfs.client.failover.random.order.

[Takanobu Asanuma <ta...@apache.org>]

Hi,

Currently, the default value of dfs.client.failover.random.order is
false. If it's true, clients access to NameNodes random order instead
of the configured order which is defined in hdfs-site.xml.

Setting dfs.client.failover.random.order=true is very important for
RBF if there are multiple routers. If it's false, all the clients
point to the same router because routers are always active.

And I think dfs.client.failover.random.order=true would be good manner
for normal HA(two-NameNodes) Cluster too. If it's false and the first
NameNode is standby, clients always access to standby NameNode at
first.

So I'd like to set dfs.client.failover.random.order to true as default
from 3.4. Does anyone have any concerns?

Thanks,
- Takanobu

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Re: About the default value of dfs.client.failover.random.order.

[Takanobu Asanuma <ta...@apache.org>]

Hi,

Seems there are no concerns for now. I created HDFS-15350 addressing it.
If you have any concerns, please comment on the jira.

Thanks,
- Takanobu

2020年4月30日(木) 17:27 Takanobu Asanuma <ta...@apache.org>:
>
> Hi,
>
> Currently, the default value of dfs.client.failover.random.order is
> false. If it's true, clients access to NameNodes random order instead
> of the configured order which is defined in hdfs-site.xml.
>
> Setting dfs.client.failover.random.order=true is very important for
> RBF if there are multiple routers. If it's false, all the clients
> point to the same router because routers are always active.
>
> And I think dfs.client.failover.random.order=true would be good manner
> for normal HA(two-NameNodes) Cluster too. If it's false and the first
> NameNode is standby, clients always access to standby NameNode at
> first.
>
> So I'd like to set dfs.client.failover.random.order to true as default
> from 3.4. Does anyone have any concerns?
>
> Thanks,
> - Takanobu

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